[TeMPOraL]

If you mean physical orientation, then well, I just lay it in a way that it's supported by pillow or bed wall to keep it vertical.

Also, I like sleeping with my tablet because I don't have to get up from bed to turn it on and check e-mail & HN ;).

[d0de]

I did mean physical orientation, but I see from rereading my question that's not clear at all.